Composite pipe.



.LANGFORD, DEUD.

B. M. PRIEST, ADMINISTRATRIX.

COMPOSITE PIPE.

APPLICATION FILED MAR. 7, 1907.

Patented Feb. 23, 1909.

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J. T. LANGFORD, DEOD. a. M. PRIEST, ADMINIIS'IIRATRIX.

oomosnn PIPE. APPLICATION FILED MAR. 7, 1907.

Patented Feb. 23, 1909.

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JOHN T. LANGFORD, OF NEWTON, MASSACHUSETTS; ELLEN MABEL PRIEST ADMINISTRATBIX Y OF SAID JOHN T. LANGFORD, DECEASED.

COIKPOSITE FIPE Specification of Letters Patent.

Patented Feb. as, 1909.

Application filed March 7, 1907. Serial No. 361,110.

To all whom it may concern:

Be itknown that I, JOHN T. LANeFoRD, of Newton, county of Middlesex, State of Massachusetts, have invented an Improvement in Composite Pipes, of which the following descriptionfin connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts. I

This invention relates to certain improvements in cement or composite pipes, and particularly those which comprise a reinforcing metal casing, lined and coated with cement, and has for its object the production of a composite pipe which shall e proof against oxidation or electrolytic action. I accomplish this object by the meansshown in the accompanying drawing, and by the method hereafter described.

In the accompanying drawings, Figure 1 is a central longitudinal section of a pipe section illustrating a preferred form of composite pipe embodying my invention. Fig. 2 is a cross section on the line 22 of Fig. 1, showing the molding devices before they are removed. Figs. 3 and 5 are central. longitudinal sections. of different modified forms of my invention. Fig. 4 is a cross section on the line 4-4 of Fig. 3. Fig. 6 is a cross section on the line 6-6 of Fig. 5;

In Figs. 1 and 2, I illustrate a preferred form of pipe which I have produced. In saidfigures, a indicates a metal tube, which may or may not be imperforate, and which is provided with a cement lining b and 'a cement coating f, said lining and coating being extendedbeyond the ends of the pipe a and homogeneously united so as to provide monolithic terminals at each end of the pi e section. In making this form of iipe the molding devices are preferably held vortically, as inmy prior patent #750,660, and the cement is compacted about the tube (1 Within a wax lined flask g and about a wax covered core 0 within the tube (1 the cement covering and lining being extended beyond each end of the tube (L and there homogeneously united so that the tube is completely embedded in the cement. After the cemcnt has become sufficiently set the core and flask will be removed, after first heating them sufli ciently to disconnect the wax therefrom. A coating and lining of wax d will thus be left upon the outer and inner surfaces of the cement body in which the tube a is embedded.

In order to provide the tube a with a cement incasement which. is thoroughly water proof or impervious to moisture, 1 then immerse the whole pipe in a bath of lirpiid wax and dissolve the wax coating and ining left by tho core and flask, and iill the pores of the cement, or cause them to become thoroughly impregnated with the wax, leaving the cement with a smooth glazed surface.

Instead of casting the cement body within a removable flask, as above described, the pipe may be cast within a metal shell or water-proof covering 71, as shown Fig. 3, which may become a permanent part of the pipe. And in this instance the shell or covering It may be provided with a lining of wax before the cement is cast therein. The pipe illustrated in Fi s. 3 and 4 is otherwise iden tical with that ilIustrated in Fig. 1.

In Fig. 5 I show a further modified form of my invention, in which the metal tube a is illustrated as being provided with an impervious coating i both externally, internally and at each end, thus providing an additional means for reventing access of moisture to the enibc ded pipe. In producing this form of my invention the tube a is provided with the impervious coating i, previous to the casting operation, which is otherwise the same as that already described, the pipe illustrated in Figs. 5 and 6 being otherwise identical with that illustrated in Figs. 3

and 4.

In the form of my invention shown in Fig. 1, in which the outer metal covering is omitted, I provide the ends of the pipe section with encircling metal bands or rings k for the purpose of making a leaded or similar joint with the adjacent pipe sections. These rings is are unnecessary when I employ the outer metal covering 71 as in Figs. 3 and 6.

The process of making the cement or composite pipe heroin shown and described forms the subject in attcr of a divisional application filed January 27th, 190), Serial No. 474,368.

Having thus described my invention, what I claim as new and desire to secure by Let tors Patent is 1. A pipe of the clmracter described, comprisiiiga metal tube having a covering and a lining of cement united beyond the ends of the tube to provide monolithic terminals.

2. A pipe of the character described comprising a metal tube having a covering and a ining of cement united beyond the ends of i the tube to provide monolithic terminals pletely.

said lining being provided With a lining of Water-proof material.

3. A pipe of the character described comprising a metal tube having a covering and a ining of Water-proof cement united beyond the ends of the tube to seal the same coin- 4. A pipe of the character described comprising a metal tube having a cement covering and a Wain-impregnated cement lining, said lining and covering being united beyond the ends of the tube to provide monolithic terminals.

5. A pipe of the character described comprising a metal tube having a covering and lining of Wax-impregnated cement united be end the ends of the tube to provide monolit ic terminate.

6. A pipe of the character described comprising a metal tube having a covering and shining oi? cement impregnated and coated emcee with a water-proof materiel, said cove and lining being united beyond the ends ol I the tube to provide monolithic terls.

7. A pipe of the character described comprising a metal tube having e lining and I covering of cement, and waterproofing means for said lining and covering the terminals of said tube:

p 8. A pipe of the character described com.- prieing a metal tube having itsint erior, ex-

terior and ends provided with an'i'i'nperviouscoatin and lined andcovered with comment JOHN T. LANGFORD. Vitnesses:

L. H. HARRIMAN, H. B. DAVIS. 

